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@M_V
What size is the cassette?
If it’s an 11-32 or some wide range like that then yeah, combined with the 22-44t range up front the gear range could be too much for the rear mech to handle.
You’re already at the 22t difference that is the most the front mech can handle so to get a bigger gear you’re either going to have to ditch the granny ring or get a new front mech that can handle a wider range (if that exists).
I’d probably:
Fit a cassette with a smaller large cog. That’ll stop the mech being so stretched out and give you more gears in the range you’re using.
Ditch the granny ring.
Fit a larger outer chainring.
Set up the front mech and shifter as if it was a road double and just not use the third click.
If you ditch the granny of course you’ll have the issue that you’ll be cross chaining a bit more so you might want to think about a new, shorter bb or moving some spacers around if it’s ht2.
Oh but first I’d find a new mechanic, one that’ll set a mech up in the right place, not just leave it where it is “because it works”.